退火状硬铝合金平面复合型损伤、断裂的细观特征研究

MESOSCOPIC CHARACTERISTICS RESEARCH ON PLANE MIXED MODE DAMAGE AND FRACTURE OF ANNEALED HARD Al-ALLOY

本文利用紧凑试样在拉-剪复合加载下进行了断裂试验．对所研究材料的断口分析表明：在复合加载下，断裂机制为由裂端向外逐渐发展的空穴扩张与聚合，断裂角随剪切分量的增加而增加，而在接近于统剪加载下，空穴的活动几乎同时发生于断裂路径上，断裂角则随剪切分量的增加而减小．

A compact specimen is put to the fracture test under tension-shear combined loading.The analysis of the fracture surface of the material under study shows that,under combinedloading,the fracture mechanism appears as expansion and gathering of voids which take placeat the crack ends and propagate outward gradually. The fractUre angle enIarges with thegrowth of shearing components. When the loading approaches to pure shearing mode,the ex-pansion and gathering of voids take place along the fracture path almost simultaneously,andthe fracture angles get smaller with the growth of shearing components.